单项选择题

The world longest bridge across the Bay is now ______ construction.

A．at
B．under
C．in
D．with
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单项选择题
The stove is still on. It ______ on. I had turned it off myself and I checked it twice.
A．can't be
B．mustn't be
C．couldn't have been
D．mustn't have been
单项选择题
Many incurable diseases such as cancer and prostatitis become commoner ______ we get older.
A．if
B．as
C．for
D．before
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